<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.app{width:200px;height: 200px; background: red;transition:width 2s height 2s;}
			.app:hover{width: 100px; height:100px; position: ;}
		</style>
	</head>
	<body>
		<div class="app"></div>
	</body>
</html>
